java8 list turn Map error Collectors.toMap :: results in "Non-static method can not be refernced from static context" java8 - List into Map, grouping, filtering, and summation operation - Code World

java8 list turn Map error Collectors.toMap :: results in "Non-static method can not be refernced from static context" java8 - List into Map, grouping, filtering, and summation operation

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java8 list turn Map error Collectors.toMap :: results in "Non-static method can not be refernced from static context" java8 - List into Map, grouping, filtering, and summation operation

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